Electronic hill-holding control system and electronic hill-holding control method for electric vehicles

Abstract

The invention relates to an electronic hill-holding control system and an electronic hill-holding control method for electric vehicles. The control system comprises a motor controller, a hill-holding module and a hill start module, the hill-holding module is used for judging whether a vehicle moves backwards on a hill according to the gear position of the vehicle and the turning of wheels, sending a hill-holding signal to control the motor controller to be switched from a torque control mode to a speed control mode when not detecting the braking signal of a brake device and controlling the rotational speed of the wheels to be zero; and the hill start module is used for sending a starting signal to control the motor controller to be switched from the speed control mode to the torque control mode controlled by an accelerator when the given torque of the accelerator is higher than the torque needed by hill holding. By switching the control modes of the motor controller when judging hill holding and hill start, the invention can automatically carry out the hill-holding and hill start functions of the electric vehicle, the whole process is continuous and reliable, and the vehicle is prevented from moving backwards when starting on the hill.

Description

technical field [0001] The invention relates to the technical field of automobiles, and more specifically, relates to an electric vehicle electronic standing slope control system and method. Background technique [0002] The current parking process of electric vehicles, including ramp parking and ramp start operations, requires the power of mechanical brakes. see figure 1 , is the control process diagram of the existing electric vehicle on the ramp stop and ramp start. Such as figure 1 As shown, when the electric vehicle is parked on a slope, step S11 needs to be executed first, and the driver manually judges the slope. Execute step S13 again and pull up the handbrake by the driver. In the process of starting on a hill, first step S14 needs to be performed, in which the driver properly depresses the accelerator to maintain a certain idle speed, and then performs step S15 to gradually loosen the handbrake, so that the electric vehicle can gradually start in step S16. [...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to provide an electric vehicle electronic standing slope control system and method in view of the defects that the standing slope of the existing electric vehicle is manually controlled and the anti-slip function is not good

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